( 9/2 - 2x )× 11/7 = 11/14
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NN
Nguyên Ngọc Ánh
30 tháng 3 2018
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23 tháng 2 2022
a, \(\dfrac{1}{3}+\dfrac{2}{3}:x=-7\) b, \(\left(\dfrac{9}{2}-2x\right).\dfrac{11}{7}=\dfrac{11}{14}\)
\(\dfrac{2}{3}:x=\left(-7\right)-\dfrac{1}{3}\) \(\dfrac{9}{2}-2x\) \(=\dfrac{11}{14}:\dfrac{11}{7}\)
\(\dfrac{2}{3}:x=-\dfrac{22}{3}\) \(\dfrac{9}{2}-2x\) \(=\dfrac{1}{2}\)
\(x=\dfrac{2}{3}.\left(-\dfrac{22}{3}\right)\) \(2x\) \(=\dfrac{9}{2}-\dfrac{1}{2}\)
\(x=-\dfrac{1}{11}\) \(2x\) \(=4\)
\(x\) \(=4:2\)
\(x\) \(=2\)
7 tháng 8 2023
\(\left(\dfrac{9}{2}-2x\right)\cdot1\dfrac{4}{7}=\dfrac{11}{14}\\ \\\\ \Rightarrow\left(\dfrac{9}{2}-2x\right)\cdot\dfrac{11}{7}=\dfrac{11}{14}\\ \\\\ \Rightarrow\dfrac{9}{2}-2x=\dfrac{11}{14}:\dfrac{11}{7}=\dfrac{11}{14}\cdot\dfrac{7}{11}=\dfrac{1}{2}\\ \\ \\ \Rightarrow2x=\dfrac{9}{2}-\dfrac{1}{2}=\dfrac{8}{2}=4\\ \\ \\ \Rightarrow x=4:2=2\)
NT
Nguyễn Thị Thương Hoài
Giáo viên
VIP
7 tháng 8 2023
(\(\dfrac{9}{2}\) - 2\(x\)) \(\times\) 1\(\dfrac{4}{7}\) = \(\dfrac{11}{14}\)
( \(\dfrac{9}{2}\) - 2\(x\)) \(\times\) \(\dfrac{11}{7}\) = \(\dfrac{11}{14}\)
\(\dfrac{9}{2}\) - 2\(x\) = \(\dfrac{11}{14}\) : \(\dfrac{11}{7}\)
\(\dfrac{9}{2}\) - 2\(x\) = \(\dfrac{1}{2}\)
2\(x\) = \(\dfrac{9}{2}\) - \(\dfrac{1}{2}\)
2\(x\) = 4
\(x\) = 4 : 2
\(x\) = 2
PT
2
10 tháng 8 2016
\(\frac{5}{7}.\frac{12}{11}+\frac{9}{7}.\frac{2}{11}-\frac{5}{7}.\frac{14}{11}\)
\(=\frac{1}{7}.\frac{1}{11}.\left(5.12+9.2-5.14\right)\)
\(=\frac{1}{77}.\left(60+18-70\right)\)
\(=\frac{1}{77}.8=\frac{8}{77}\)
PH
0
PB
0
14 tháng 4 2023
a: =35/17-18/17-9/5+4/5
=1-1=0
b: =-7/19(3/17+8/11-1)
=7/19*18/187=126/3553
c: =26/15-11/15-17/3-6/13
=1-6/13-17/3
=7/13-17/3=-200/39
NN
2
16 tháng 4 2022
\(\dfrac{5}{7}\cdot\dfrac{9}{11}+\dfrac{-5}{7}\cdot\dfrac{-2}{11}+\dfrac{1}{14}=\dfrac{45}{77}+\dfrac{10}{77}+\dfrac{1}{14}=\dfrac{5}{7}+\dfrac{1}{14}=\dfrac{10}{14}+\dfrac{1}{14}=\dfrac{11}{14}\)
16 tháng 4 2022
\(\dfrac{5}{7}.\dfrac{9}{11}-\dfrac{5}{7}.-\dfrac{2}{11}+\dfrac{1}{14}=\dfrac{5}{7}.\left(\dfrac{9}{11}+\dfrac{2}{11}\right)+\dfrac{1}{14}=\dfrac{5}{7}.1+\dfrac{1}{14}=\dfrac{10+1}{14}=\dfrac{11}{14}\)
MC
18 tháng 7 2021
\(-\frac{12}{35}\div\frac{7}{11}-\frac{23}{35}\div\frac{7}{11}-\frac{5}{11}\)
\(=\left(-\frac{12}{35}-\frac{23}{35}\right)\div\frac{7}{11}-\frac{5}{11}\)
\(=-1\div\frac{7}{11}-\frac{5}{11}\)
\(=-\frac{11}{7}-\frac{5}{11}\)
\(=-\frac{156}{77}\)